一些建筑物的水塔在管网的季节性水压较高时能自流进水，在季节性水压较低时，自流所进的水不够用户使用或根本无法自流进水。遇到这种情况都以加装水泵解决，有时一台水泵供多个水塔。手动控制水泵的开停机，往往到没有水时才开机，水满时没有人及时停机。使用液位控制时，水? Water towers of some buildings can flow into the water when the seasonal pressure of the pipe network is relatively high. When the seasonal water pressure is low, the water flowing into the gravity flow is not enough for users to use or it cannot flow into the water at all. In this case, additional pumps are used to solve the problem. Sometimes one pump is used for multiple water towers. Manually controlling the start and stop of the water pump often starts the machine when there is no water, and nobody shuts down in time when the water is full. When using level control, water?